A. Molecular size
B. Temperature
C. Volume
D. Pressure
✅ The correct answer is option B.
Thermodynamics MCQs
Equation which relates pressure, volume and temperature of a gas is called the
A. Equation of state
B. Gibbs Duhem equation
C. Ideal gas equation
D. None of these
✅ The correct answer is option A.
The main feature of Carnot refrigeration cycle is that, it
A. Does not need the addition of external work for its functioning
B. Transfers heat from high temperature to low temperature
C. Accomplishes the reverse effect of the heat engine
D. None of these
✅ The correct answer is option C.
Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be
A. Same
B. Doubled
C. Halved
D. One fourth of its original value
✅ The correct answer is option A.
In case of an __________ process, the temperature of the system increases.
A. Isothermal compression
B. Isothermal expansion
C. Adiabatic expansion
D. Adiabatic compression
✅ The correct answer is option D.
Which law of the thermodynamics provids basis for measuring the thermodynamic property?
A. First law
B. Zeroth law
C. Third law
D. Second law
✅ The correct answer is option B.
What happens in a reversible adiabatic expansion process?
A. Heating takes place
B. Cooling takes place
C. Pressure is constant
D. Temperature is constant
✅ The correct answer is option B.
Efficiency of a Carnot engine working between temperatures T₁ and T₂ (T₁ < T₂) is
A. (T₂ – T₁)/T₂
B. (T₂ – T₁)/T₁
C. (T₁ – T₂)/T₂
D. (T₁ – T₂)/T₁
✅ The correct answer is option A.
In case of the decomposition of hydroiodic acid (2HI ⇋ H₂ + I₂), addition of H₂ (at equilibrium condition) will
A. Increase the partial pressure of I₂
B. Decrease the partial pressure of HI
C. Diminish the degree of dissociation of HI
D. None of these
✅ The correct answer is option C.
In the equation, PVn = constant, if the value of n is in between 1 and y (i.e. Cp/Cv), then it represents a reversible __________ process.
A. Isometric
B. Polytropic
C. Isentropic
D. Isobaric
✅ The correct answer is option B.